Index: ubsan.c
===================================================================
RCS file: /cvsroot/src/common/lib/libc/misc/ubsan.c,v
retrieving revision 1.4
diff -u -r1.4 ubsan.c
--- ubsan.c	4 Feb 2019 22:07:41 -0000	1.4
+++ ubsan.c	13 Feb 2019 16:26:11 -0000
@@ -110,7 +110,7 @@
 
 #define NUMBER_SIGNED_BIT	1U
 
-#if __SIZEOF_INT128__
+#ifdef __SIZEOF_INT128__
 typedef __int128 longest;
 typedef unsigned __int128 ulongest;
 #else
@@ -1298,8 +1298,11 @@
 		break;
 #endif
 	case WIDTH_64:
+		/* FALLTHROUGH */
 	case WIDTH_32:
+		/* FALLTHROUGH */
 	case WIDTH_16:
+		/* FALLTHROUGH */
 	case WIDTH_8:
 		snprintf(pBuffer, zBUfferLength, "%" PRId64, STATIC_CAST(int64_t, L));
 		break;
@@ -1325,8 +1328,11 @@
 		break;
 #endif
 	case WIDTH_64:
+		/* FALLTHROUGH */
 	case WIDTH_32:
+		/* FALLTHROUGH */
 	case WIDTH_16:
+		/* FALLTHROUGH */
 	case WIDTH_8:
 		snprintf(pBuffer, zBUfferLength, "%" PRIu64, STATIC_CAST(uint64_t, L));
 		break;
@@ -1358,7 +1364,9 @@
 	switch (zDeserializeTypeWidth(pType)) {
 #ifdef __HAVE_LONG_DOUBLE
 	case WIDTH_128:
+		/* FALLTHROUGH */
 	case WIDTH_96:
+		/* FALLTHROUGH */
 	case WIDTH_80:
 		memcpy(&LD, pNumber, sizeof(long double));
 		snprintf(pBuffer, zBUfferLength, "%Lg", LD);
@@ -1512,7 +1520,9 @@
 		/* NOTREACHED */
 #ifdef __HAVE_LONG_DOUBLE
 	case WIDTH_128:
+		/* FALLTHROUGH */
 	case WIDTH_96:
+		/* FALLTHROUGH */
 	case WIDTH_80:
 		DeserializeFloatOverPointer(pBuffer, zBUfferLength, pType, REINTERPRET_CAST(unsigned long *, ulNumber));
 		break;
@@ -1524,6 +1534,7 @@
 		}
 		/* FALLTHROUGH */
 	case WIDTH_32:
+		/* FALLTHROUGH */
 	case WIDTH_16:
 		DeserializeFloatInlined(pBuffer, zBUfferLength, pType, ulNumber);
 		break;